MOT Risk Index.co.uk

Does the Smart City-Coupe fail the MOT on noise, emissions and leaks more than it should?

The Smart City-Coupe records 12.49 noise, emissions and leaks failure items per 100 initial MOT tests (2019–2024), against 8.89 expected for a car of the same age mix: more than expected for its class and age (+3.60, 95% interval +3.26 to +3.94). It ranks 57 of 678 models on noise, emissions and leaks (1 = most failures above expected).

Data release dvsa-2024-v2 (24 Sep 2026) · page updated 30 Sep 2026 · all models on noise, emissions and leaks · check a Smart City-Coupe by registration

What exactly fails on noise, emissions and leaks?

The most frequent DVSA defect wording in this group on the Smart City-Coupe is “Lambda coefficient outside the default limits or the range specified by the manufacturer”, recorded 1,813 times in 2019–2024.

Smart City-Coupe: most frequent noise, emissions and leaks defect wordings, 2019–2024 (30+ items each)
DVSA defect wordingItemsPer 100 tests
Lambda coefficient outside the default limits or the range specified by the manufacturer1,8134.34
Emissions levels exceed default limits1,1932.85
Emissions levels exceed the manufacturer's specified limits6101.46
Emissions test unable to be completed4891.17
Engine MIL illuminated indicating a malfunction4591.10

Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 41,807 (initial tests) · Method: failure items (major and minor) grouped by DVSA's defect tree; wordings with 30+ items · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

If a Smart City-Coupe gets a noise, emissions and leaks advisory, how often does it fail next time?

11.2% of Smart City-Coupe MOTs with a noise, emissions and leaks advisory were followed by a fail in the same group at the next MOT, typically 12.1 months and 2,192 miles later (3,017 advisories followed).

Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 3,017 (advisories followed) · Method: the same vehicles followed to their next ordinary MOT · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

Other pages for this model

Smart City-Coupe 2000 · Smart City-Coupe 2001 · Smart City-Coupe 2002 · Smart City-Coupe 2003 · Smart City-Coupe 2004 · Smart City-Coupe 2005 · Smart City-Coupe 2006 · Smart City-Coupe 2007 · Smart City-Coupe 2008 · Smart City-Coupe 2009 · Smart City-Coupe 2010 · Smart City-Coupe by postcode area · Smart City-Coupe body, chassis and structure failures · Smart City-Coupe brakes failures · Smart City-Coupe vehicle identification failures · Smart City-Coupe lamps, reflectors and electrics failures · Smart City-Coupe road wheels failures · Smart City-Coupe seat belts and airbags failures · Smart City-Coupe steering failures · Smart City-Coupe suspension failures · Smart City-Coupe tyres failures · Smart City-Coupe visibility failures